Lead Full Stack Engineer

Lead Full Stack Engineer (Founding Role, Hybrid)

Job Available

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Lead Full Stack Engineer

(Founding Role, Remote)

Have any questions? Reach out at

hello@lendkoi.com

Are you authorized to work in the U.S.?*

Will you now, or in the future, require sponsorship for employment visa status?

Do you have professional experience building and shipping full-stack applications in production — both frontend (TypeScript/React) and backend (Python/Django)?*

Do you have 5+ years of hands-on, professional software engineering experience?*

Have you worked as a staff engineer, lead engineer, senior engineer, VP of Engineering, Head of Engineering, or CTO?*

How many years of professional experience do you have?*

Most recent professional title*

Most recent employer.*

Most recent college or university*

What state are you located in?*

First Name*

Last Name*

Email*

LinkedIn URL*

Of all your job-related skills, what is your favorite thing to do?*

What is something you’ve learned about yourself in your previous role?*

Please check all items you have direct and involved experience with:*AWS (Elastic Beanstalk, RDS, SQS)

TypeScript

React and Next.js (App Router)

Python

Django / Django REST Framework

PostgreSQL

Celery / background task queues

Redis

Third-party API integrations (webhooks, retries, idempotency)

CI/CD (Github Actions / Docker)

Upload Your Resume*

Why do you want to work at LendKoi?*

Can you complete a background check upon request?*

Are you available for an in-person New York City interview*

Can you provide references upon request?*

Apply Now

About the role

This is a rare opportunity to build our agentic lending platform end-to-end — from the borrower-facing web app through the Django API and the fintech integrations that move money and make credit & loans work.

This is a genuinely full-stack codebase, not frontend-with-a-BFF

most features touch both the app and the backend. You'll help set technical direction, own problems from ticket to production, raise the engineering bar as the team grows, and work closely with experienced leaders, a cross-functional team, and our vendor partners.

You'll scale your impact through strategic decisions, reviews, and mentorship — while still shipping. It's an early leadership role with room to grow as the team does.

The compensation for this role is pay + equity. Flexible New York City remote/hybrid. Full time.

The stack you'll work in

• Frontend: Next.js, React, TypeScript, TanStack React Query, Zustand, React Hook Form + Zod, and a shared component library built on Radix UI + MUI.
• Backend: Django + Django REST Framework, Python, PostgreSQL, Celery, Redis.
• Schema-first API: OpenAPI schema that generates a fully typed TypeScript client - types flow from Django serializers to React components, so schema drift is caught at compile time, not in production.
• Infrastructure: AWS (Elastic Beanstalk and core services), GitHub Actions CI/CD
• Fintech Integrations.

Preferred

• Experience designing and supporting the AI/data-science model lifecycle in fintech - from architecture and prototyping through to production-grade code and application integration, alongside the engineering team.
• Credit risk, underwriting, or cash-flow modeling experience.
• Familiarity with fair-lending, model-risk management, or regulatory requirements (e.g., ECOA / Reg B adverse action).
• Familiarity with MLOps platforms and model serving infrastructure.
• Applied mathematics background - discrete mathematics, complex systems, and mathematical modeling.
• Strong understanding of data structures and distributed systems for large-scale data processing, with an eye for efficient, scalable algorithm and code design.

What you'll own

• Hands-on, full-stack feature delivery across the borrower app and the Django API - most features span both.
• Fintech integration work: new vendor APIs, reliable webhook handling, retry and reconciliation semantics, and payment and loan-servicing workflows.
• Infrastructure evolution - growing with scale.
• Raising the engineering bar: testing strategy, observability, performance, and security in a regulated lending domain.

Preferred

• Experience designing and supporting the AI/data-science model lifecycle in fintech - from architecture and prototyping through to production-grade code and application integration, alongside the engineering team.
• Credit risk, underwriting, or cash-flow modeling experience.
• Familiarity with fair-lending, model-risk management, or regulatory requirements (e.g., ECOA / Reg B adverse action).
• Familiarity with MLOps platforms and model serving infrastructure.
• Applied mathematics background - discrete mathematics, complex systems, and mathematical modeling.
• Strong understanding of data structures and distributed systems for large-scale data processing, with an eye for efficient, scalable algorithm and code design.

Qualifications

• 5+ years of hands-on experience building and deploying applications in production, including technical leadership.
• Technical experience as a staff engineer, lead engineer, senior engineer, VP of Engineering, Head of Engineering, CTO, or similar.
• Strong TypeScript/React (Next.js App Router experience a plus) and strong Python/Django (including Django REST Framework) - this is a genuinely full-stack role.
• Comfortable with PostgreSQL data modeling, Celery/queue-based async patterns, and third-party API integration at production quality (idempotency, retries, webhooks).
• Working AWS knowledge (Beanstalk/EC2, RDS, SQS) - enough to own deploys and debug production.
• Strong familiarity with Git, CI/CD pipelines, and automated deployment.
• A testing habit - you write tests without being asked (Vitest / Testing Library, Playwright, pytest).
• Strong command of AI coding tools, with disciplined verification and data-privacy guardrails.
• Excellent documentation skills and a commitment to organized, understandable code that scales as the team grows.
• Care about correctness with money movement.
• Curiosity about fintech and empathy for users - you're passionate about building technology that solves real-world financial challenges.
• Founding-engineer temperament: owns problems end-to-end, pragmatic about scope, comfortable with ambiguity and vendor quirks; a self-starter who builds without constant oversight.
• Flexible New York City remote/hybrid.
• Background check, in-person New York interview, and references required.

Preferred

• Fintech or lending experience - a plus, not a requirement.
• Experience with schema-first / OpenAPI-driven development and typed API clients.
• Experience with payment processing, loan origination, or loan servicing systems.
• Zero-downtime migration discipline and on-call / runbook experience.
• Familiarity with MLOps, ML engineering, or supporting the AI/data-science model lifecycle.
• Understanding of data structures and distributed systems for large-scale data processing.

Why Join LendKoi?

LendKoi is a financial technology company that provides credit and a digital financial suite for immigrants and US citizens new to credit. We're on a mission to empower individuals to achieve stability and thrive. We're an early-stage startup backed by Techstars NYC and top angels with an incredible team.

Mission-driven

Be part of a mission to provide fair and accessible credit and unlock opportunities for underbanked communities.

At The Frontier

Join a company at the frontier of consumer financial technology, credit, and payments.

High-impact role

You will shape how thousands first experience and understand us.

Creative Freedom

Test ideas, iterate quickly, and bring personality to fintech.

Small, fast team

You’ll work closely with the executive team, with plenty of ownership.

Learn a Ton

From incredibly talented leaders, and genuinely good people; trust and integrity are at the core of how we operate.

Paid, full-time, flexible remote

Paid, full-time, flexible remote/hybrid role